On 6/23/06, John Rodgers <inua@charter.net> wrote: > > Can anyone tell me what the flow rate of intake air - cubic feet per > minute - is on the WBX 2.1 L engine ...and.... for one cylinder .... say > at top rpm and/or horsepower? > > Also, what is the cylinder volume of air taken into the engine on a > single intake stroke?
Well, to answer your second question first, I bet each cylinder pulls in about 525 cubic centimeters per intake stroke. From that I'd hazard a guess that at 4500rpm you're sucking 4725 liters of air per minute? (4500rpm * 2.1liters / 2 revs per intake stroke) And finally - anyone have any opinions on this concept......"Improved > vaporization of fuel will improve gas mileage!"
There is truth to that, but it doesn't matter as much as it sounds like it should. When the fuel comes out of the injector and hits the 100degC+ head and intake valve, it vaporizes about as well as it possibly can. Some argument can be made that there are schemes that would improve vaporization when the engine is cold, when the fuel has a tendency to condense on the cool metal parts, but optimizing for the first five minutes of engine run time is something of a waste of effort. So far, every "trick" I've seen offered that claims "better fuel vaporization" has been shown to produce nothing beyond a fatter wallet for the seller. The best way to improve mileage is to drive slower and not press the gas pedal down so far. The gross inefficiencies of gasoline engines, particularly the good ol' wasserboxer, are pretty much beyond the reach of chemical tweaks like acetone. Amusingly, a sheet metal intake choke (aka a "Turbonator") will actually improve gas mileage, but only by reducing max airflow, essentially doing the same as not pressing down the accelerator as far. -- John Bange '90 Vanagon - "Geldsauger" |
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